Cloud native EDA tools & pre-optimized hardware platforms
In the context of an SoC flow, a functional engineering change order (ECO) is a method to directly patch, or modify the gate-level, post synthesis version of a design. The reason for this modification could include fixing an error that was discovered in the RTL (pre-synthesis) version of the design, applying optimization to the design or updating the design based on a new customer requirement.
The post-synthesis version is patched directly to avoid the costly and time-consuming process of completely re-implementing the design, which includes logic synthesis, technology mapping, place, route, layout extraction, and timing verification. EDA tools provide the ability to reduce the scope of tasks such as synthesis to only the portions impacted by the ECO, thus saving time. These tools can also verify equivalence of the RTL and patched gate-level implementation using formal methods.
When presented with a functional ECO, there are three items to consider when automating the process:
The figure below illustrates the process:
Functional ECOs provide a critical late-stage optimization step for any design. This is where errors are corrected, optimization is applied, and late-stage customer requests are accommodated. Since this process occurs late in the design cycle, there is significant risk regarding the introduction of an error that will escape to silicon, creating a very costly and time-consuming problem.
Functional ECO automation can dramatically reduce the chances of an error escape. The specific benefits include:
Since functional ECOs are typically applied to the design late in the process, there is less opportunity to verify and optimize these changes. Essentially, the changes need to be “right from the start”. Some challenges to overcome include:
草榴社区 Formality ECO provides a new and robust way of implementing functional ECOs. Formality ECO delivers faster turn-around time, smaller patches and better quality of results. The figure below summarizes these benefits:
草榴社区 PrimeECO is the industry’s first signoff-driven ECO closure solution that achieves signoff closure in a single cockpit.
草榴社区 ECO Fusion builds on the fused signoff capabilities by reducing the need for excessive ECO iterations by allowing rapid design changes during the physical implementation phase with IC Compiler II, resulting in faster timing convergence and reducing the design cycle by up to 30%.